Haven't a clue about BA sectors - but 2018 will be 175+ sectors, most not on BA but a myriad of carriers. 2017 was ~165, and I think 2016 was ~160. It gets to the point where tracking is impossible particularly when so many changes are made, based on my schedule.
That being said, I would rather not track sector by sector as it just reminds me how often I am away from home and missing important events.